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(Reference retrieved automatically from SciELO through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Aminonaphthoquinone Mannich Bases Derived from Lawsone and Their Copper(II) Complex Derivatives: Synthesis and Potential Cholinesterase Inhibitors as Identified by On-flow Assay

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Author(s):
Adriana F. L. Vilela [1] ; Bárbara M. Frugeri [2] ; André L. F. Sarria [3] ; Rodrigo O. S. Kitamura [4] ; João B. Fernandes [5] ; Maria F. G. F. Silva [6] ; Quezia B. Cass [7] ; Carmen L. Cardoso [8]
Total Authors: 8
Affiliation:
[1] Universidade de São Paulo. Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto - Brasil
[2] Universidade de São Paulo. Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto - Brasil
[3] Universidade Federal de São Carlos. Departamento de Química - Brasil
[4] Universidade Federal de São Carlos. Departamento de Química - Brasil
[5] Universidade Federal de São Carlos. Departamento de Química - Brasil
[6] Universidade Federal de São Carlos. Departamento de Química - Brasil
[7] Universidade Federal de São Carlos. Departamento de Química - Brasil
[8] Universidade de São Paulo. Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto - Brasil
Total Affiliations: 8
Document type: Journal article
Source: Journal of the Brazilian Chemical Society; v. 27, n. 3, p. 534-545, 2016-03-00.
Abstract

A new series of Mannich bases derived from 2-hydroxy-1,4-naphthoquinone (lawsone), substituted benzaldehydes and two primary amines, and their Cu2+ complexes were synthesized and evaluated for their potential as selective cholinesterase inhibitors (ChEIs). Immobilized capillary enzyme reactors (ICERs) bearing butyrylcholinesterase (BChE) and acetylcholinesterase (AChE) were used not only for the on-flow screening assay but also for determining the inhibitory potency and equilibrium binding constants of the lead inhibitors. Eight copper complexes were identified and characterized as potent reversible and selective ChEIs with inhibitory potencies (IC50) and constants of inhibition (Ki) ranging from 1.24 to 11.5 µmol L-1. One of the compounds was particularly promising, showing IC50 and Ki values of 1.24 ± 0.01 and 1.06 ± 0.01 µmol L-1, respectively, for huAChE. These values were lower than those for the standard inhibitor galanthamine (IC50 = 206 ± 30.0 and Ki = 126 ± 18.0 µmol L-1). Even though, it is showing noncompetitive inhibition of huAChE and linear mixed-type inhibition of eeAChE. These complexes showed a promising cholinesterase inhibitory activity and can be used as model inhibitors. (AU)

FAPESP's process: 13/01710-1 - Enzyme ligand: new models of screening
Grantee:Quezia Bezerra Cass
Support Opportunities: Research Projects - Thematic Grants
FAPESP's process: 07/06393-3 - Obtention of insecticide, fungitoxic against leaf-cutting ants and its simbiont fungus in Astronium juglandifolium and search for organometallic complexes of active compounds to leaf-cutting ants control
Grantee:André Lúcio Franceschini Sarria
Support Opportunities: Scholarships in Brazil - Master
FAPESP's process: 06/58043-3 - Leaf cutting ants control, integrated studies
Grantee:João Batista Fernandes
Support Opportunities: Research Projects - Thematic Grants
FAPESP's process: 07/07196-7 - Biomonitored phytochemical study of Picramnia bahiensis and Thyrsodium schomburgkianum: obtaining insecticide, fungicide against leaf-cutting ants and their symbiotic fungi and micro-encapsulation of active compounds
Grantee:Rodrigo Ossamu Saga Kitamura
Support Opportunities: Scholarships in Brazil - Doctorate (Direct)